Electrochemical passivation of gallium arsenide surface with organic self-assembled monolayers in aqueous electrolytes

Klaus Adlkofer; Motomu Tanaka; Heiko Hillebrandt; Gerald Wiegand; Erich Sackmann; Tibor Bolom; Rainer Deutschmann; Gerhard Abstreiter

doi:10.1063/1.126636

Electrochemical passivation of gallium arsenide surface with organic self-assembled monolayers in aqueous electrolytes

Klaus Adlkofer, Motomu Tanaka, Heiko Hillebrandt, Gerald Wiegand, Erich Sackmann, Tibor Bolom, Rainer Deutschmann, Gerhard Abstreiter

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

Abstract

Self-assembled monolayers of octadecylthiol (ODT) were reconstituted on freshly etched gallium arsenide (n-GaAs) for the electrochemical stabilization against decomposition of the surfaces (passivation) in aqueous buffers. The surface composition was evaluated by x-ray photoelectron spectroscopy to optimize the surface treatment before ODT deposition. Electrochemical properties of the monolayers were monitored by cyclic voltammetry and impedance spectroscopy. The impedance spectrum of the photoctched n-GaAs after the deposition of the ODT monolayer was stable in an aqueous electrolyte at pH=7.5 for more than 24 h within the sensitivity of our experimental technique. The effective passivation of GaAs surfaces is an essential step towards biosensor applications.

Original language	English
Pages (from-to)	3313-3315
Number of pages	3
Journal	Applied Physics Letters
Volume	76
Issue number	22
DOIs	https://doi.org/10.1063/1.126636
State	Published - 29 May 2000

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abstract = "Self-assembled monolayers of octadecylthiol (ODT) were reconstituted on freshly etched gallium arsenide (n-GaAs) for the electrochemical stabilization against decomposition of the surfaces (passivation) in aqueous buffers. The surface composition was evaluated by x-ray photoelectron spectroscopy to optimize the surface treatment before ODT deposition. Electrochemical properties of the monolayers were monitored by cyclic voltammetry and impedance spectroscopy. The impedance spectrum of the photoctched n-GaAs after the deposition of the ODT monolayer was stable in an aqueous electrolyte at pH=7.5 for more than 24 h within the sensitivity of our experimental technique. The effective passivation of GaAs surfaces is an essential step towards biosensor applications.",

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T1 - Electrochemical passivation of gallium arsenide surface with organic self-assembled monolayers in aqueous electrolytes

AU - Adlkofer, Klaus

AU - Tanaka, Motomu

AU - Hillebrandt, Heiko

AU - Wiegand, Gerald

AU - Sackmann, Erich

AU - Bolom, Tibor

AU - Deutschmann, Rainer

AU - Abstreiter, Gerhard

PY - 2000/5/29

Y1 - 2000/5/29

N2 - Self-assembled monolayers of octadecylthiol (ODT) were reconstituted on freshly etched gallium arsenide (n-GaAs) for the electrochemical stabilization against decomposition of the surfaces (passivation) in aqueous buffers. The surface composition was evaluated by x-ray photoelectron spectroscopy to optimize the surface treatment before ODT deposition. Electrochemical properties of the monolayers were monitored by cyclic voltammetry and impedance spectroscopy. The impedance spectrum of the photoctched n-GaAs after the deposition of the ODT monolayer was stable in an aqueous electrolyte at pH=7.5 for more than 24 h within the sensitivity of our experimental technique. The effective passivation of GaAs surfaces is an essential step towards biosensor applications.

AB - Self-assembled monolayers of octadecylthiol (ODT) were reconstituted on freshly etched gallium arsenide (n-GaAs) for the electrochemical stabilization against decomposition of the surfaces (passivation) in aqueous buffers. The surface composition was evaluated by x-ray photoelectron spectroscopy to optimize the surface treatment before ODT deposition. Electrochemical properties of the monolayers were monitored by cyclic voltammetry and impedance spectroscopy. The impedance spectrum of the photoctched n-GaAs after the deposition of the ODT monolayer was stable in an aqueous electrolyte at pH=7.5 for more than 24 h within the sensitivity of our experimental technique. The effective passivation of GaAs surfaces is an essential step towards biosensor applications.

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Electrochemical passivation of gallium arsenide surface with organic self-assembled monolayers in aqueous electrolytes

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